Synchronous Script Analysis

Output

Synchronous Script Analysis

✅ Good news: No blocking synchronous scripts found in the hot paths.

What I Checked

Deno.Command usage across 11 files
.output() vs .outputSync() patterns
readTextFileSync / writeTextFileSync usage
Infinite loops and blocking patterns

All Deno.Command Uses Are Async

Every command execution uses await cmd.output() or cmd.spawn():

// All command patterns (25 instances across 11 files)
konui/src/router.ts      - Claude spawn, git, restart scripts
konui/mcp/server.ts     - Git tools, test runner, lint, type-check
konui/src/reports.ts    - Report generation (deno task)
konui/src/metrics.ts    - df, lsof, git commands
konsole/src/claude.ts   - Claude process spawning
→ All use: await cmd.output() ✓

⚠️ Sync File I/O (Low Risk)

Found 3 files using sync I/O, but none are concerning:

konui/src/kontask-db.ts (Acceptable)

readTextFileSync(KONTASKS_FILE)   // ~50KB file, <1ms
writeTextFileSync(...)            // Atomic write, <1ms

Purpose: JSONL append-only log. Sync ensures atomicity. File is small (~hundreds of entries).

konsole/src/providers/index.ts (Acceptable)

readTextFileSync(configPath)      // Provider config, <100 bytes

Purpose: Load provider config at startup. Tiny file, runs once.

kondata/scripts/resize-suburb-sliders.ts (Acceptable)

writeFileSync(outputPath, data)   // Inside ImageMagick callback

Purpose: CLI script for batch image resize. Not a server. Runs manually.

Summary

Blocking subprocess calls	0 ✓
Sync file I/O in hot paths	0 ✓
Sync file I/O in cold paths	3 (acceptable)
Infinite loops without await	0 ✓

The kontask-db sync writes are the only ones that could theoretically block, but with a ~50KB file and <1ms write time, they're not a practical concern. Converting them to async would add complexity without meaningful benefit.

Quick Actions

Original Request

No layout configured

Details

Type General

Status Completed

Scope vibetools

Tags performancecode-review

Created 9 Jan 2026, 2:02 am

Updated 9 Jan 2026, 2:02 am

Timing

⏱️ 108.7s

0 tools

● TTFE 0% ● Thinking 100% ● Tools 0%

Created By claude

Raw Data

{
  "id": "a024c18d-35da-48bd-b7a7-1d5cc1a19c55",
  "type": "general",
  "status": "completed",
  "title": "Synchronous Script Analysis",
  "description": "Analysis of synchronous patterns in the codebase",
  "context": {
    "output": "<div style=\"background:#1e1e1e;color:#e0e0e0;padding:20px;border-radius:8px;font-family:'Consolas','Monaco',monospace;\">\n<h2 style=\"font-family:sans-serif;color:#fff;margin:0 0 16px 0;\">Synchronous Script Analysis</h2>\n\n<p style=\"color:#98c379;margin-bottom:20px;\">✅ <strong>Good news:</strong> No blocking synchronous scripts found in the hot paths.</p>\n\n<h3 style=\"color:#61afef;margin:20px 0 12px 0;\">What I Checked</h3>\n<ul style=\"line-height:1.8;\">\n<li><code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">Deno.Command</code> usage across 11 files</li>\n<li><code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">.output()</code> vs <code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">.outputSync()</code> patterns</li>\n<li><code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">readTextFileSync</code> / <code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">writeTextFileSync</code> usage</li>\n<li>Infinite loops and blocking patterns</li>\n</ul>\n\n<h3 style=\"color:#61afef;margin:20px 0 12px 0;\">All Deno.Command Uses Are Async</h3>\n<p style=\"margin-bottom:12px;\">Every command execution uses <code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">await cmd.output()</code> or <code style=\"background:#2d2d2d;padding:2px 6px;border-radius:4px;\">cmd.spawn()</code>:</p>\n<pre style=\"background:#2d2d2d;padding:16px;border-radius:6px;overflow-x:auto;line-height:1.6;font-size:13px;\"><span style=\"color:#7f848e;\">// All command patterns (25 instances across 11 files)</span>\n<span style=\"color:#e5c07b;\">konui/src/router.ts</span>      <span style=\"color:#7f848e;\">- Claude spawn, git, restart scripts</span>\n<span style=\"color:#e5c07b;\">konui/mcp/server.ts</span>     <span style=\"color:#7f848e;\">- Git tools, test runner, lint, type-check</span>\n<span style=\"color:#e5c07b;\">konui/src/reports.ts</span>    <span style=\"color:#7f848e;\">- Report generation (deno task)</span>\n<span style=\"color:#e5c07b;\">konui/src/metrics.ts</span>    <span style=\"color:#7f848e;\">- df, lsof, git commands</span>\n<span style=\"color:#e5c07b;\">konsole/src/claude.ts</span>   <span style=\"color:#7f848e;\">- Claude process spawning</span>\n<span style=\"color:#98c379;\">→ All use: await cmd.output() ✓</span></pre>\n\n<h3 style=\"color:#e5c07b;margin:20px 0 12px 0;\">⚠️ Sync File I/O (Low Risk)</h3>\n<p style=\"margin-bottom:12px;\">Found 3 files using sync I/O, but none are concerning:</p>\n\n<div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\">\n<p style=\"margin:0 0 8px 0;\"><strong style=\"color:#e5c07b;\">konui/src/kontask-db.ts</strong> <span style=\"color:#98c379;\">(Acceptable)</span></p>\n<pre style=\"margin:0;color:#abb2bf;font-size:13px;\">readTextFileSync(KONTASKS_FILE)   <span style=\"color:#7f848e;\">// ~50KB file, <1ms</span>\nwriteTextFileSync(...)            <span style=\"color:#7f848e;\">// Atomic write, <1ms</span></pre>\n<p style=\"color:#7f848e;margin:8px 0 0 0;font-size:12px;\">Purpose: JSONL append-only log. Sync ensures atomicity. File is small (~hundreds of entries).</p>\n</div>\n\n<div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\">\n<p style=\"margin:0 0 8px 0;\"><strong style=\"color:#e5c07b;\">konsole/src/providers/index.ts</strong> <span style=\"color:#98c379;\">(Acceptable)</span></p>\n<pre style=\"margin:0;color:#abb2bf;font-size:13px;\">readTextFileSync(configPath)      <span style=\"color:#7f848e;\">// Provider config, <100 bytes</span></pre>\n<p style=\"color:#7f848e;margin:8px 0 0 0;font-size:12px;\">Purpose: Load provider config at startup. Tiny file, runs once.</p>\n</div>\n\n<div style=\"background:#2d2d2d;padding:16px;border-radius:6px;margin-bottom:16px;\">\n<p style=\"margin:0 0 8px 0;\"><strong style=\"color:#e5c07b;\">kondata/scripts/resize-suburb-sliders.ts</strong> <span style=\"color:#98c379;\">(Acceptable)</span></p>\n<pre style=\"margin:0;color:#abb2bf;font-size:13px;\">writeFileSync(outputPath, data)   <span style=\"color:#7f848e;\">// Inside ImageMagick callback</span></pre>\n<p style=\"color:#7f848e;margin:8px 0 0 0;font-size:12px;\">Purpose: CLI script for batch image resize. Not a server. Runs manually.</p>\n</div>\n\n<h3 style=\"color:#61afef;margin:20px 0 12px 0;\">Summary</h3>\n<table style=\"width:100%;border-collapse:collapse;margin-bottom:16px;\">\n<tr style=\"border-bottom:1px solid #3d3d3d;\">\n<td style=\"padding:8px;\">Blocking subprocess calls</td>\n<td style=\"padding:8px;color:#98c379;\">0 ✓</td>\n</tr>\n<tr style=\"border-bottom:1px solid #3d3d3d;\">\n<td style=\"padding:8px;\">Sync file I/O in hot paths</td>\n<td style=\"padding:8px;color:#98c379;\">0 ✓</td>\n</tr>\n<tr style=\"border-bottom:1px solid #3d3d3d;\">\n<td style=\"padding:8px;\">Sync file I/O in cold paths</td>\n<td style=\"padding:8px;color:#e5c07b;\">3 (acceptable)</td>\n</tr>\n<tr>\n<td style=\"padding:8px;\">Infinite loops without await</td>\n<td style=\"padding:8px;color:#98c379;\">0 ✓</td>\n</tr>\n</table>\n\n<p style=\"color:#7f848e;font-size:13px;\">The kontask-db sync writes are the only ones that could theoretically block, but with a ~50KB file and <1ms write time, they're not a practical concern. Converting them to async would add complexity without meaningful benefit.</p>\n</div>",
    "requestedAt": "2026-01-09T00:00:00.000Z",
    "requestId": "9d042a95-d3bb-4110-8eff-2992acb91f1c",
    "choices": [
      {
        "label": "All good",
        "value": "No action needed - the sync patterns are acceptable",
        "primary": true
      },
      {
        "label": "Async kontask-db",
        "value": "Convert kontask-db.ts to use async file I/O for better concurrency"
      },
      {
        "label": "Audit something else",
        "value": "Look at other potential performance bottlenecks"
      }
    ],
    "turnTiming": {
      "totalMs": 108650,
      "ttfeMs": 100,
      "thinkingMs": 108548,
      "toolExecutionMs": 0,
      "toolCallCount": 0,
      "thinkingPct": 100,
      "toolsPct": 0,
      "ttfePct": 0
    }
  },
  "createdBy": "claude",
  "createdAt": "2026-01-08T16:02:34.726Z",
  "updatedAt": "2026-01-08T16:02:40.431Z",
  "requestId": "9d042a95-d3bb-4110-8eff-2992acb91f1c",
  "scope": "vibetools",
  "tags": [
    "performance",
    "code-review"
  ],
  "targetUser": "claude"
}